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Impedance of RF shield on ceramic chamber in the rapid cycling synchrotron of China Spallation Neutron Source 认领 引用
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作者 Liang‑Sheng Huang Bin Wu +6 位作者 Ming‑Yang Huang Ren‑Hong Liu Biao Tan Peng‑Cheng Wang Yong‑Chuan Xiao Li‑Rui Zeng Xiao Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第1期130-140,共11页
In a rapid cycling synchrotron(RCS),the magnetic field is synchronized with the beam energy,creating a highly dynamic magnetic environment.A ceramic chamber with a shielding layer(RF shield),composed of a series of co... In a rapid cycling synchrotron(RCS),the magnetic field is synchronized with the beam energy,creating a highly dynamic magnetic environment.A ceramic chamber with a shielding layer(RF shield),composed of a series of copper strips connected to a capacitor at either end,is typically employed as a vacuum chamber to mitigate eddy current effects and beam coupling impedance.Consequently,the ceramic chamber exhibits a thin-walled multilayered complex structure.Previous theoretical studies have suggested that the impedance of such a structure has a negligible impact on the beam.However,recent impedance measurements of the ceramic chamber in the China Spallation Neutron Source(CSNS)RCS revealed a resonance in the low-frequency range,which was confirmed by further theoretical analysis as a source of beam instability in the RCS.Currently,the magnitude of this impedance cannot be accurately assessed using theoretical calculations.In this study,we used the CST Microwave Studio to confirm the impedance of the ceramic chamber.Further simulations covering six different types of ceramic chambers were conducted to develop an impedance model in the RCS.Additionally,this study investigates the resonant characteristics of the ceramic chamber impedance,finding that the resonant frequency is closely related to the capacitance of the capacitors.This finding provides clear directions for further impedance optimization and is crucial for achieving a beam power of 500 kW for the CSNS Phase-Ⅱ project(CSNS-Ⅱ).However,careful attention must be paid to the voltage across the capacitors. 展开更多
关键词 Beam coupling impedance Ceramic chamber RF shield Resonance High dynamic magnetic environment
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Shielding integral experiment of slab Zr samples based on a D–T neutron source 认领 引用
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作者 Xin‑Yi Pan Yang‑Bo Nie +8 位作者 Shi‑Yu Zhang Yan‑Yan Ding Qi Zhao Kuo‑Zhi Xu Xiao‑Yu Wang Bei‑Bo He Hong‑Tao Cheng Xi‑Chao Ruan Jie Ren 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第7期233-247,共15页
Zirconium(Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliabili... Zirconium(Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliability of nuclear data evaluated for Zr isotopes are directly related to the safety and efficiency of nuclear engineering. To provide experimental data for refining Zr nuclear data, we obtained the leakage neutron time-of-flight(TOF) spectra of natural Zr samples with three thicknesses at six angles using the D–T fusion neutron source in an integral experimental setup. The experimental results were compared with simulated TOF spectra generated using the Monte Carlo N-Particle Transport Code and nuclear data libraries, including CENDL-3.2, ENDF/B-Ⅷ.0, JEFF-3.3, and JENDL-5. An analysis of the calculated-to-experimental ratios revealed the following:(1) The CENDL-3.2 library lightly underestimated elastic scattering at small angles but significantly overestimated it at larger angles and in discrete inelastic scattering ranges.(2) The ENDF/B-Ⅷ.0 library significantly underestimated the discrete inelastic scattering ranges.(3) The JEFF-3.3 library consistently overestimated the measurements in both the elastic and discrete inelastic scattering ranges.(4) The JENDL-5 library demonstrated the best agreement with the experimental data among all libraries. These results highlight the inconsistencies in existing nuclear data for Zr isotopes and emphasize the necessity for further refinement to enhance their accuracy and reliability. 展开更多
关键词 Slab Zr Leakage neutron spectra Shielding integral experiment Evaluated nuclear data
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A shielding integral experiment with different thickness of slab9Be samples based on deuterium-tritium neutron source 认领 引用
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作者 Shi-Yu Zhang Yang-Bo Nie +10 位作者 Qi Zhao Xin-Yi Pan Yan-Yan Ding Kuo-Zhi Xu Xiao-Yu Wang Bei-Bo He Qi Sun Jie Ren Hong-Tao Chen Xi-Chao Ruan Zheng Wei 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第11期327-345,共19页
Beryllium(9Be)serves as a crucial neutron multiplier and reflection material,being extensively employed in the nuclear industry.The evaluated nuclear data are utilized in the design of the nuclear devices.Following... Beryllium(9Be)serves as a crucial neutron multiplier and reflection material,being extensively employed in the nuclear industry.The evaluated nuclear data are utilized in the design of the nuclear devices.Following the interaction between neutrons and9Be,all neutrons generated stem from the9Be(n,2n)8Be reaction channel,except for the elastic scattering reaction channel.Nevertheless,the data of the outgoing neutron double differential cross section of the reaction channel provided by the latest internationally evaluated libraries still exhibit considerable discrepancies.A shielding integral experiment based on slab9Be samples with measurements of neutron spectra leaked from different angles is an effective approach to verify the double differential cross-section data.Hence,in this study,a shielding integral experiment of9Be samples of different thicknesses was conducted using a nanosecond pulsed deuterium-tritium neutron source established by the China Institute of Atomic Energy.The neutron time-of-flight spectra of three thicknesses(4.4 cm,8.8 cm,and 13.2 cm)and six angles(47°,58°,73°,107°,122°,and 133°)were measured by the neutron time-of-flight method,and 18 sets of experimental data were obtained.Additionally,the MCNP-4C program was used to obtain the simulated results of the leakage neutron spectra using the evaluated nuclear data of9Be from the CENDL-3.2,ENDF/B-Ⅷ.0,JENDL-5,and JEFF-3.3 libraries.The simulated results of the leakage neutron spectra were compared with the experimental results,and the results showed that in the elastic scattering energy region,the simulated results from the CENDL-3.2,ENDF/B-Ⅷ.0,and JENDL-5 libraries were slightly higher at small angles and slightly lower at large angles.In the(n,2n)energy region,the simulated results from the CENDL-3.2 library were significantly different from the experimental results in terms of spectral shape,and the simulated results from the ENDF/B-Ⅷ.0 and the JENDL-5 libraries were in good agreement with the experimental results at small angles but low at large angles.The simulated results from the JEFF-3.3 library showed serious underestimation at all angles. 展开更多
关键词 Beryllium Evaluated nuclear data Shielding integral experiment Deuterium tritium neutron source Neutron time-of flight spectrum MCNP-4C program
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Feasibility of medical radioisotope production based on the proton beams at China Spallation Neutron Source 认领 引用 被引量：4
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作者 Bing Jiang Bin-Bin Tian +1 位作者 Han-Tao Jing Qi-Fan Dong 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第6期26-39,共14页
The utilization of a proton beam from the China Spallation Neutron Source(CSNS)for producing medical radioisotopes is appealing owing to its high current intensity and high energy.The medical isotope production based ... The utilization of a proton beam from the China Spallation Neutron Source(CSNS)for producing medical radioisotopes is appealing owing to its high current intensity and high energy.The medical isotope production based on the proton beam at the CSNS is significant for the development of future radiopharmaceuticals,particularly for theα-emitting radiopharmaceu-ticals.The production yield and activity of typical medical isotopes were estimated using the FLUKA simulation.The results indicate that the 300-MeV proton beam with a power of 100 kW at CSNS-II is highly suitable for proof-of-principle studies of most medical radioisotopes.In particular,this proton beam offers tremendous advantages for the large-scale production of alpha radioisotopes,such as 225Ac,whose theoretical production yield can reach approximately 57 Ci/week.Based on these results,we provide perspectives on the use of CSNS proton beams to produce radioisotopes for medical applications. 展开更多
关键词 CSNS proton beam Medical isotope production α-Emitting radionuclides Nuclidic purity analysis
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Development of Time-of-Flight Polarized Neutron Imaging at the China Spallation Neutron Source 认领 引用 被引量：4
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作者 Ahmed Salman Jianrong Zhou +10 位作者 Jianqing Yang Junpei Zhang Chuyi Huang Fan Ye Zecong Qin Xingfen Jiang Syed Mohd Amir Wolfgang Kreuzpaintner Zhijia Sun Tianhao Wang Xin Tong 《Chinese Physics Letters》 SCIE EI CAS CSCD 2022年第6期47-51,共5页
A time-of-flight polarized neutron imaging setup was realized by integrating an in situ pumped polarized 3He spin filter and energy dispersive neutron camera on the neutron technique development beamline(BL-20)of t... A time-of-flight polarized neutron imaging setup was realized by integrating an in situ pumped polarized 3He spin filter and energy dispersive neutron camera on the neutron technique development beamline(BL-20)of the China Spallation Neutron Source(CSNS).Test experiments were performed with a solenoid with aluminum wire as a sample.These demonstrated that polarized radiography with a field of view in diameter 2.0 cm at different wavelengths can be obtained.The wavelength-dependent polarization was used to distinguish the neutron polarization behavior for different positions inside and outside the solenoid.The results of this work show the possibility of applying the technique at CSNS and marks a milestone for future polarized neutron imaging developments. 展开更多
关键词 polarized integrating applying
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Development of a Spin-Exchange Optical Pumping-Based Polarized 3He System at the China Spallation Neutron Source (CSNS) 认领 引用 被引量：3
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作者 Chuyi Huang Junpei Zhang +8 位作者 Fan Ye Zecong Qin Syed Mohd Amir Zachary Norris Buck Ahmed Salman Wolfgang Kreuzpaintner Xin Qi Tianhao Wang Xin Tong 《Chinese Physics Letters》 SCIE EI CAS CSCD 2021年第9期38-42,共5页
Polarized 3He neutron spin filters(NSFs)can be used as a vital tool for neutron polarization production and analysis.The China Spallation Neutron Source(CSNS),as one of the major neutron facilities in China,has commit... Polarized 3He neutron spin filters(NSFs)can be used as a vital tool for neutron polarization production and analysis.The China Spallation Neutron Source(CSNS),as one of the major neutron facilities in China,has committed resources to the development of a polarized3He NSF program to support its growing polarized neutron research.A spin-exchange optical pumping(SEOP)-based polarized3He system and other necessary hardware for NSF transport has been recently developed.The performance of the system is benchmarked using an in-house developed cell named“Trident”.Neutron beam measurements yield a3He polarization of 77%with over 200 h of on-beam relaxation time.Combining this newly developed SEOP system with the recently reported cell fabrication station,CSNS is now capable of the fully self-sustained production of3He NSFs that shall support its future neutron polarization research. 展开更多
关键词 polarized system relaxation
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Development of a ~3He Gas Filling Station at the China Spallation Neutron Source 认领 引用 被引量：2
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作者 Zecong Qin Chuyi Huang +8 位作者 ZNBuck WKreuzpaintner SMAmir ASalman Fan Ye Junpei Zhang Chenyang Jiang Tianhao Wang Xin Tong 《Chinese Physics Letters》 SCIE EI CAS CSCD 2021年第5期16-20,共5页
At the China Spallation Neutron Source(CSNS), we have developed a custom gas-filling station, a glassblowing workshop, and a spin-exchange optical pumping(SEOP) system for producing high-quality 3He-based neutron s... At the China Spallation Neutron Source(CSNS), we have developed a custom gas-filling station, a glassblowing workshop, and a spin-exchange optical pumping(SEOP) system for producing high-quality 3He-based neutron spin filter(NSF) cells. The gas-filling station is capable of routinely filling 3He cells made from GE180 glass of various dimensions, to be used as neutron polarizers and analyzers on beamlines at the CSNS. Performance tests on cells fabricated at our gas-filling station are conducted via neutron transmission and nuclear-magneticresonance measurements, revealing nominal filling pressures, and a saturated ~3He polarization in the region of 80%, with a lifetime of approximately 240 hours. These results demonstrate our ability to produce competitive NSF cells to meet the ever-increasing research needs of the polarized neutron research community. 展开更多
关键词 NSF Development of a Gas Filling Station at the China Spallation Neutron Source
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Silicon photomultiplier based scintillator thermal neutron detector for China Spallation Neutron Source(CSNS) 认领 引用 被引量：1
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作者 岳秀萍 朱志甫 +11 位作者 唐彬 黄畅 于潜 陈少佳 王修库 许虹 周诗慧 蔡小杰 杨浩 万志勇 孙志嘉 刘云涛 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期35-41,共7页
The energy-resolved neutron imaging spectrometer(ERNI)will be installed in 2022 according to the spectrometer construction plan of the China Spallation Neutron Source(CSNS).The instrument requires neutron detectors wi... The energy-resolved neutron imaging spectrometer(ERNI)will be installed in 2022 according to the spectrometer construction plan of the China Spallation Neutron Source(CSNS).The instrument requires neutron detectors with the coverage area of approximately 4 m2in 5°-170°neutron diffraction angle.The neutron detection efficiency needs to be better than 40%at 1 A neutron wavelength.The spatial resolution should be better than 3 mm×50 mm in the horizontal and vertical directions respectively.We develop a one-dimensional scintillator neutron detector which is composed of the6Li F/Zn S(Ag)scintillation screens,the wavelength-shifting fiber(WLSF)array,the silicon photomultipliers(Si PMs),and the self-designed application-specific integrated circuit(ASIC)readout electronics.The pixel size of the detector is designed as 3 mm×50 mm,and the neutron-sensitive area is 50 mm×200 mm.The performance of the detector prototype is measured using neutron beam 20#of the CSNS.The maximum counting rate of 247 k Hz,and the detection efficiency of63%at 1.59 A are obtained.The test results show that the performance of the detector fulfills the physical requirements of the ERNI under construction at the CSNS. 展开更多
关键词 neutron detector silicon photomultipliers(SiPMs) 6LiF/ZnS(Ag) China Spallation Neutron Source(CSNS)
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Candidate injector design for the Southern Advanced Photon Source based on linac and booster 认领 引用
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作者 Liang-Sheng Huang Yan-Liang Han +5 位作者 Wei-Hang Liu Jian-Liang Chen Sheng Wang Yi Jiao Xiao Li Jia-Xin Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第2期67-78,共12页
The Southern Advanced Photon Source(SAPS)is a diffraction-limited synchrotron light source under design,which employs longitudinal injection as its primary injection scheme.This kind of injection scheme requires that ... The Southern Advanced Photon Source(SAPS)is a diffraction-limited synchrotron light source under design,which employs longitudinal injection as its primary injection scheme.This kind of injection scheme requires that the injected beam has a short bunch length and low emittance,and the preferred injector should offer high stability and low cost.Therefore,an injector based on a booster synchrotron was developed.The proposed injector includes a 250 MeV linac,a booster synchrotron that ramps the beam energy to 3.5 GeV,and two beam transport lines to ensure efficient beam delivery and beam quality preservation.The linac utilizes a thermionic high-voltage DC gun for reliable operation and features a bunching system with an advanced focusing system to preserve the emittance.To meet the injection requirements of the SAPS,a comprehensive design for the booster has been conducted.The booster synchrotron employs a threefold lattice structure,incorporating modified theoretical minimum emittance cells with a small momentum compaction factor and a high voltage to achieve an emittance of 3.98 nm rad and a bunch length of 4.8 mm.The injector has the potential to deliver a high charge,reducing the injection period of the storage ring to less than 1 min.Simulations demonstrated the expected performance,with a transmission efficiency of 90%,confirming its capability to meet the injection requirement of the SAPS storage ring.This design offers a stable and efficient solution for the SAPS. 展开更多
关键词 Southern Advanced Photon Source Longitudinal injection Booster synchrotron Emittance Bunch length
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Development of a polarized-neutron imaging technique at the China Advanced Research Reactor 认领 引用
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作者 Zheng‑Yao Li Tian‑Hao Wang +13 位作者 Si‑Qin Meng Jun‑Pei Zhang Li‑Jie Hao Jian Tang Tian‑Yun Wang Shi‑Hao Ruan Hong‑Liang Wang Mei‑Mei Wu Long Tian Bin Wang Ahmed Salman Lin‑Feng He Xin Tong Dong‑Feng Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第8期297-307,共11页
In contrast to conventional neutron imaging by measuring the attenuation contrast,polarized-neutron imaging(PNI)has proved to be a powerful tool for investigating the spatial distribution of magnetic fields inside and... In contrast to conventional neutron imaging by measuring the attenuation contrast,polarized-neutron imaging(PNI)has proved to be a powerful tool for investigating the spatial distribution of magnetic fields inside and around bulk samples owing to the intrinsic magnetic moment of neutrons.This technique benefits from the measurement of the cumulative precession of the neutron polarization passing through a magnetic field.We report the recent development of the PNI capability at the China Advanced Research Reactor(CARR),where two neutron imaging instruments(thermal and cold)have been established.To further develop and realize the PNI technique,a PNI facility consisting of a double-crystal pyrolytic graphite monochromator,supermirror polarizer with three parallel V-shaped cavities and an in situ optically pumped 3He neutron spin filter as a neutron spin analyzer was successfully developed and tested based on an established cold neutron imaging instrument.This setup will be beneficial for enhancing neutron imaging and neutron optics in CARR in the future. 展开更多
关键词 Neutron radiography Polarized-neutron imaging Magnetic imaging Magnetic field Polarizing supermirror
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Improving MCUCN code to simulate ultracold neutron storage and transportation in superfluid4He 认领 引用
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作者 Xue-Fen Han Fei Shen +6 位作者 Bin Zhou Xiao-Xiao Cai Tian-Cheng Yi Zhi-Liang Hu Song-Lin Wang Tian-Jiao Liang Robert Golub 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第3期235-246,共12页
The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and ... The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and transportation in a superfluid4He(SFHe,He-Ⅱ)source accurately.This limitation arose from the absence of an4He upscattering mechanism and the absorption of3He.And the provided source energy distribution in MCUCN is different from that in SFHe source.This study introduced enhancements to MCUCN to address these constraints,explicitly incorporating the4He upscattering effect,the absorption of3He,the loss caused by impurities on converter wall,UCN source energy distribution in SFHe,and the transmission through negative optical potential.Additionally,a Python-based visualization code for intermediate states and results was developed.To validate these enhancements,we systematically compared the simulation results of the Lujan Center Mark3 UCN system by MCUCN and the improved MCUCN code(iMCUCN)with UCNtransport simulations.Additionally,we compared the results of the SUN1 system simulated by MCUCN and iMCUCN with measurement results.The study demonstrates that iMCUCN effectively simulates the storage and transportation of ultracold neutrons in He-Ⅱ. 展开更多
关键词 Ultracold neutron Storage Transportation Improved MCUCN code Upscattering effect Absorption by3He
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Deformation Behavior and Mechanisms of fcc High-Entropy Alloys:Insights from Neutron Diffraction 认领 引用
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作者 Zhao Yanchun Yao Yatao +9 位作者 Zhang Fan Huang Yan Zhang Yibo Lu Zhichao Zhang Qi Fu Xiaoling Wang Anding Zhang Fei Song Wenli Ma Dong 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第3期655-664,共10页
The multi-principal element characteristic of high-entropy alloys has revolutionized the conventional alloy design concept of single-principal element,endowing them with excellent mechanical properties.However,owing t... The multi-principal element characteristic of high-entropy alloys has revolutionized the conventional alloy design concept of single-principal element,endowing them with excellent mechanical properties.However,owing to this multi-principal element nature,high-entropy alloys exhibit complex deformation behavior dominated by alternating and coupled deformation mechanisms.Therefore,elucidating these intricate deformation mechanisms remains a key challenge in current research.Neutron diffraction(ND)techniques offer distinct advantages over traditional microscopic methods for characterizing such complex deformation behavior.The strong penetration capability of neutrons enables in-situ,real-time,and non-destructive detection of structural evolution in most centimeter-level bulk samples under complex environments,and ND allows precise characterization of lattice site occupations for light elements,such as C and O,and neighboring elements.This review discussed the principles of ND,experiment procedures,and data analysis.Combining with recent advances in the research about face-centered cubic high-entropy alloy,typical examples of using ND to investigate the deformation behavior were summarized,ultimately revealing deformation mechanisms dominated by dislocations,stacking faults,twinning,and phase transformations. 展开更多
关键词 high-entropy alloys neutron diffraction face centered-cubic structure deformation mechanism
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Development and application of an eV neutron polarization for parity violation studies at CSNS Back-n beamline 认领 引用
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作者 Xu Qin Tianhao Wang +26 位作者 Xuanbo Chen Changdong Deng Yongce Gong Zenghang Huang Wei Jiang Zhengquan Liu Guangyuan Luan Haotian Luo Qiuyue Luo Yongjia Lv You Lv Nikolaos Vassilopoulos Xichao Ruan William Michael Snow Kang Sun Sepehr Samiei Jian Tang Shilin Wang Hongyi Wu Xiaomin Xiong Xinyu Yuan Junpei Zhang Mofan Zhang Qiwei Zhang Qingbo Zheng Ruirui Fan Xin Tong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CSCD 2026年第8期66-81,共16页
The dynamic enhancement of symmetry-breaking effects in neutron-nucleus resonances provides a sensitive testing ground for Time-Reversal Invariance Violation(TRIV).Exploiting this mechanism,the Neutron Optics Parity a... The dynamic enhancement of symmetry-breaking effects in neutron-nucleus resonances provides a sensitive testing ground for Time-Reversal Invariance Violation(TRIV).Exploiting this mechanism,the Neutron Optics Parity and Time Reversal Experiment(NOPTREX)seeks to elucidate the origin of the universe's baryon asymmetry.Critical to this effort is the precise measurement of Parity Violation(PV)asymmetries,which is essential to calibrate the nuclear parameters required for future TRIV experiments.To facilitate these studies,we developed an eV polarized neutron at the Back-n white neutron beamline of the China Spallation Neutron Source(CSNS).Neutron polarization is generated by an in-situ Spin-Exchange Optical Pumping(SEOP)3He filter.Spin manipulation is performed by an adiabatic spin flipper,while spin polarization is preserved over the flight path by a vacuum transport system equipped with a solenoidal guide field.Experiments successfully measured an asymmetry of approximately 7.8%±2.4(stat.)%±0.3(sys.)%at the 0.750 eV p-wave resonance of 139La.These results are in agreement with previous results on this resonance and validate the system's capability for PV measurements. 展开更多
关键词 polarized neutron parity violation adiabatic spin flipper
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Erratum:Development of a Spin-Exchange Optical Pumping-Based Polarized 3He System at the China Spallation Neutron Source(CSNS)[Chin.Phys.Lett.38,092801(2021)] 认领 引用
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作者 黄楚怡 张俊佩 +8 位作者 叶凡 秦泽聪 Syed Mohd Amir Zachary Norris Buck Ahmed Salman Wolfgang Kreuzpaintner 齐欣 王天昊 童欣 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第5期123-123,共1页
In our published paper,国an important affiliation(University of Chinese Academy of Sciences,Beijing 100049,China)should be added as the 3rd affiliation for the first author,as given above.References[1]Huang C,ZhangJ,Y... In our published paper,国an important affiliation(University of Chinese Academy of Sciences,Beijing 100049,China)should be added as the 3rd affiliation for the first author,as given above.References[1]Huang C,ZhangJ,Ye F,Qin Z,Amir S M,Buck Z N,Salman A,Kreuzpaintner W,Qi X,Wang T,and Tong X 2021 Chin.Phys.Lett.38092801。 展开更多
关键词 Polarized
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Developing time-of-flight polarized neutron capability at the China Spallation Neutron Source 认领 引用 被引量：2
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作者 Long Tian Ahmed Salman +7 位作者 Chu-Yi Huang Yu-Chen Dong Fan Ye Ze-Cong Qin Wolfgang Kreuzpaintner Jun-Pei Zhang Tian-Hao Wang Xin Tong 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第10期12-19,共8页
Polarized neutrons play an indispensable role in neutron scattering research and have been incorporated into various neutron diffractometers and spectrometers. Recognizing the importance of polarized neutrons, the Chi... Polarized neutrons play an indispensable role in neutron scattering research and have been incorporated into various neutron diffractometers and spectrometers. Recognizing the importance of polarized neutrons, the China Spallation Neutron Source(CSNS) has dedicated resources for developing its own capabilities for polarized neutron techniques. Hence, a polarized neutron development platform was allocated to the BL-20 beam port at CSNS for the purpose of facilitating new technological developments and calibration of instruments. Here, we report the progress we have made in terms of using the established development platform at BL-20, including the characterization of neutron spin filter cells manufactured at CSNS, the calibration of self-developed polarized neutron instruments, performance of the polarized neutron technique applied to beamlines,and associated simulation work for beamline magnetic field environments. These results demonstrate the capability of the CSNS to develop time-of-flight polarized neutron instruments and techniques in-house, which will be incorporated into the construction of CSNS neutron beamlines. 展开更多
关键词 Polarized neutron Polarization analysis Neutron instrumentation
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Elucidation of the CO2 adsorption mechanism of [Zn2(mtz)2(ox)]using neutron powder diffraction 认领 引用
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作者 Lingxiang Bao Jing-Hong Li +12 位作者 Rui-Biao Lin Jianyuan Wu Zhenhong Tan Wu Xie Wenhai Ji Dong Zhang Anucha Koedtruad Jingjing Ma Wang Hay Kan Feng Pan Toru Ishigaki Takashi Kamiyama Ping Miao 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第5期784-787,共4页
Metal-organic framework[Zn2(tz)2(ox)](CALF-20)has attracted great attention due to its excellent ability to capture carbon dioxide.There are great interests to develop similar adsorbents for gas adsorption and s... Metal-organic framework[Zn2(tz)2(ox)](CALF-20)has attracted great attention due to its excellent ability to capture carbon dioxide.There are great interests to develop similar adsorbents for gas adsorption and separation.To develop more efficient porous adsorbent,it is essential to study the relationship between these structures and properties.Neutron diffraction has been proved to be an excellent tool for determining both the structural details of MOF host and the precise locations of adsorbed gas within the pore,offering unique opportunities for understanding the structure-properties relationship.Herein,we report the synthesis and structure characterization of MOF[Zn2(mtz)2(ox)],which exhibits high CO2adsorption capacity.Neutron powder diffraction experiment on the solvated,the activated and CO2loaded samples unveils the preferred binding sites of CO2within the MOFs,where CO2locates toward the center of the pore and interacts with methyl group or triazole via C–H···O hydrogen bonding.The adsorption process of CO2in[Zn2(mtz)2(ox)]is accompanied by the cell volume expansion,so[Zn2(mtz)2(ox)]with more compact structure can show a better adsorption performance.The structure-properties relationship in[Zn2(mtz)2(ox)]elucidated by present study offer a path to develop more advanced porous physisorbent materials. 展开更多
关键词 MOFs Adsorption site Neutron powder diffraction CO₂adsorption Structure–property relationship
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Back-n white neutron source at CSNS and its applications 认领 引用 被引量：52
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作者 Jing-Yu Tang Qi An +73 位作者 Jiang-Bo Bai Jie Bao Yu Bao Ping Cao Hao-Lei Chen Qi-Ping Chen Yong-Hao Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-Qing Feng Ke-Qing Gao Xiao-Long Gao Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Xi-Ru Huang Hao-Yu Jiang Wei Jiang Zhi-Jie Jiang Han-Tao Jing Ling Kang Bo Li Chao Li Jia-Wen Li Qiang Li Xiao Li Yang Li Jie Liu Rong Liu Shu-Bin Liu Xing-Yan Liu Ze Long Guang-Yuan Luan Chang-Jun Ning Meng-Chen Niu Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Jia Sun Zhi-Xin Tan Xin-Yi Tang Bin-Bin Tian Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Xiao-Yun Yang Yi-Wei Yang Han Yi Li Yu Tao Yu Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang Zhi-Yong Zhang Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu The CSNS Back-n Collaboration 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第1期95-104,共10页
Back-streaming neutrons from the spallation target of the China Spallation Neutron Source(CSNS)that emit through the incoming proton channel were exploited to build a white neutron beam facility(the so-called Back-n w... Back-streaming neutrons from the spallation target of the China Spallation Neutron Source(CSNS)that emit through the incoming proton channel were exploited to build a white neutron beam facility(the so-called Back-n white neutron source),which was completed in March 2018.The Back-n neutron beam is very intense,at approximately 29107 n/cm2/s at 55 m from the target,and has a nominal proton beam with a power of 100 kW in the CSNS-I phase and a kinetic energy of 1.6 GeV and a thick tungsten target in multiple slices with modest moderation from the cooling water through the slices.In addition,the excellent energy spectrum spanning from 0.5 eV to 200 MeV,and a good time resolution related tothe time-of-flight measurements make it a typical white neutron source for nuclear data measurements;its overall performance is among that of the best white neutron sources in the world.Equipped with advanced spectrometers,detectors,and application utilities,the Back-n facility can serve wide applications,with a focus on neutron-induced cross-sectional measurements.This article presents an overview of the neutron beam characteristics,the experimental setups,and the ongoing applications at Backn. 展开更多
关键词 White neutron source Nuclear data measurements Experimental setups Neutron applications
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NeuDATool:an Open Source Neutron Data Analysis Tools,Supporting GPU Hardware Acceleration,and across-Computer Cluster Nodes Parallel 认领 引用 被引量：1
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作者 Chang-li Ma He Cheng +3 位作者 Tai-sen Zuo Gui-sheng Jiao Ze-hua Han Hong Qin 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2020年第6期727-732,I0003,共6页
Empirical potential structure refinement is a neutron scattering data analysis algorithm and a software package.It was developed by the disordered materials group in the British spallation neutron source(ISIS)in 1980s... Empirical potential structure refinement is a neutron scattering data analysis algorithm and a software package.It was developed by the disordered materials group in the British spallation neutron source(ISIS)in 1980s,and aims to construct the most-probable atomic structures of disordered materials in the field of chemical physics.It has been extensively used during the past decades,and has generated reliable results.However,it implements a shared-memory architecture with open multi-processing(OpenMP).With the extensive construction of supercomputer clusters and the widespread use of graphics processing unit(GPU)acceleration technology,it is now possible to rebuild the EPSR with these techniques in the effort to improve its calculation speed.In this study,an open source framework NeuDATool is proposed.It is programmed in the object-oriented language C++,can be paralleled across nodes within a computer cluster,and supports GPU acceleration.The performance of NeuDATool has been tested with water and amorphous silica neutron scattering data.The test shows that the software can reconstruct the correct microstructure of the samples,and the calculation speed with GPU acceleration can increase by more than 400 times,compared with CPU serial algorithm at a simulation box that has about 100 thousand atoms.NeuDATool provides another choice to implement simulation in the(neutron)diffraction community,especially for experts who are familiar with C++programming and want to define specific algorithms for their analysis. 展开更多
关键词 Neutron diffraction Neutron scattering Empirical potential structure refinement Graphics processing unit C++
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10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source 认领 引用 被引量：2
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作者 Qiang Li Li‑Jiao Wang +70 位作者 Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu Tao Li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Yi‑Na Liu Guang‑Yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第8期58-68,共11页
Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron radiography.Its complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron s... Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron radiography.Its complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and detector.Consequently,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above keV.The white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to MeV.Neutron-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low noise.In this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the Back-n.Individual heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be identified.In particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time. 展开更多
关键词 Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification
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Measurement of the relative neutron sensitivity curve of a LaBr3(Ce)scintillator based on the CSNS Back-n white neutron source 认领 引用
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作者 刘建 王东明 +3 位作者 甫跃成 李忠宝 易晗 易龙涛 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第10期66-72,共7页
A scintillator detector consisting of a LaBr3(Ce)(0.5%)scintillator,a photomultiplier tube(PMT),and an oscilloscope were used to study the neutron sensitivities of the LaBr3(Ce)scintillator at the China Spallati... A scintillator detector consisting of a LaBr3(Ce)(0.5%)scintillator,a photomultiplier tube(PMT),and an oscilloscope were used to study the neutron sensitivities of the LaBr3(Ce)scintillator at the China Spallation Neutron Source(CSNS)Back-n white neutron source in the double-bunch and single-bunch operation modes,respectively.Under the two operational modes,the relative neutron sensitivity curves of the LaBr3(Ce)scintillator in the energy regions of 1–20 MeV and 0.5–20 MeV were obtained for the first time.In the energy range of 1–20 MeV,the two curves were nearly identical.However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment.The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment.Above the minimum measurable energy of the double-bunch experiment,there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr3(Ce)scintillator and those of other scintillators with a similar neutron response signal intensity. 展开更多
关键词 relative neutron sensitivity LaBr3(Ce) China Spallation Neutron Source(CSNS) white neutron source
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